Stenciling material and process of using the same.



` APPLICATION FILED DEO. 13, 1911. 1 01,258.

Patented June 23 55542511157155555155.755,115.5,... 1115555, 'Fiittlfiff/ .:5.5...,...1lzL-Hn0lilbli5555e .555555555 WITNEssEs mwN-Ton off ATTOR N EY UNITED STATES PATENT OFFICE.

vALBERT BLAKE DICK, F LAKE FOREST, ILLINOIS, ASSIGNOR T0 A. B.l DICK COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

STENCILING MATERIAL AND PROCESS OF USING 'THE SAME.

To all whom t may concern: j

Be it known that I, ALBERT B. DICK, a

citizen of the United States, and a resident ploy, beneath or back of such a stencil sheet,

of Lake Forest,lin the county of Lake and State of Illinois, have invented certain new by stylus or type, either directly upon such sheet or upon a fine tissue sheet overlying the same. And it has been common to ema so-called perforating or extractor sheet, of open-woven material such as silk gauze,to carry away the wax expressed by the impact of type, for example, from the p stencil sheet?.

As an improvement in the art of stencil duplication as thus described, it has been proposed-to employ, instead of the waxcoated sheet above described, a sheet of open,

porous material impregnated with coagulated protein and a suitable tempering agent such as sugar. Such a sheet is dry but hygroscopic and to adapt it for conversion into a stencil by pressureas, for instance, by the-impactof the type of a writing machine thereon), it is necessary to preliminarily moi'sten the sheet and this ,has commonly been done by passing a wet sponge over the surface thereof before placing the sheet in the machine. This practice is objectionable for various reasons, one being the lack of uniformity with which the moistening is accomplished, another being the evaporation of the moisture Vwhere completion of the stenciling operation is delayed, etc. By my invention these objections arewholly obviated, and, in addition, a better stencil,capable of producing better copies, results from the stencil-cutting operation.

. Yoshino paper, this being impregnated In carrying/out my invention I employ, preferably, afstencil sheet of the character above referred to,z'. e. having a base` of open,r porous character, such as Japanese with coagulated protein combined, if desired, with aY suitable tempering agentfsuch as white sugar. Such a `sheet is dry but hygro.

Specification of Letters Patent.

Applica-tion filed December 13, 1911.

' Patented June 2a, .1914. Serial N o. 665,590.

large number of copies under the usual process of duplication.

A stencil sheet such as that here referred lto may be made by coat- -mg or impregnating a base of the character above described With a solution substantially as follows: Gelatin .one`part, whitesugar one-half part, water three parts, alcohol ve parts, glacial acetic acid, pure, one-tenth part, glycerin three parts and potassium dichromate in crystals, sufficient to sensibly color lthe coml ound.

. I do not c]l im to have invented a stencil sheet somad butl refer to it here merely as an illustrati n ofla sheet. capable of use as a part of `y invention and in which use it is desirabie to meisten the sheet preliminarily to typing characters thereon. it expressly understood, however, that I may useas pai-tof my invention any stencil sheet, no matter what its construction, which may 't advantage be employed in connection with my invention as hereinafter more particularly pointed out.

Combined with a stencil sheet such, for example, as that above described, I employ a backing sheet, preferably immediately underlying the stencil sheet and carrying within itself moisture in a suitable form. I prefer to use a sheet of soft and somewhat absorbent paper previously treated with a solution of glycerin and water in proper proportions, such, for example, as from seventy (70) to eighty (80) per cent. of water and from twenty (20) tothirty (30) per cent. of glycerin. If desired, I may also combine with the stencil sheet and moist'backing, a third sheet ofv somewhat harder and firmer character, forming a carrier for the two overlying sheetsand also acting to protect the platen of the writing machinefrom the moisture, etc. 4 b

In carrying out the'y stencil-cutting operation,'the stencil sheet and moist backing sheet may be introduced into the machine in the usual manner. I prefer, however, as above indicated, to introduce into the machine all threepf the sheets above described,

which may,if desired, be secured together atone end. On the platen of the machine the stencil sheet will be exposed, the soft backing sheet will be next and the dry platen protecting sheet will lie next to the platen.

In this correlation 'of stencil sheet and backing sheet, the moisturee/o the latter will be taken up to a proper d gree by the former, which, as heretofore indicated, is hygroscopic. Thereby the coating of coagulated protein upon the stencil sheet will become suiliciently softened to further the operation of producing the characters in such stencll sheet as a result of the impact of the type of the writing machine. This, therefore, dispensesv withthe necessity Jror preliminarily passing a moisteued sponge over the surface of the stencil sheet, which is not entirely practicable and which is characterized by certain disadvantages, amon thembeing the lack of uniformity with which the moisture is applied. There is, however, a further and important feature of the invention in ,the use of the soitbacking sheet above described,-in that when itis employed in the connection above stated, it greatly decreases the destructive fracturing of the interwoven fibers of the base ot thestencil sheet, as well las such tendency as theremay be, where the impact of the type -is greater than necessary, to entirely cut the centers of loop letters from the stencil. As a result, Aby the use of ,the combination described, a better and more desirable stencil is produced, from which duplicate copies of a high order of excellence may be obtained.

The invention is illustrated `in the 'accompanyingdrawing, in which the single figure is a longitudinal cross section, ota series rif-sheets combined as herein described. Of these, the upper sheet, A, is a stencil sheet of suitable character, as, forpexample, one having a paper base coated or impregnated with a compound such as that above stated.- So far as my invention is concerned, this sheet is merely one which, whatever its character, can to advantage be moistened preliminarily to cutting the stencil thereon, or

be operated'on when overlying a backing of soft material." Immediately underlying the stencil sheet, A, is the backing sheet, B, above described, and/both the stencil sheet, A, and backing sheet, B, as above shown,

are combined with a firm paper carrier sheet,

C, one endof which may be provided with lsuitable means (not shown)l for securing the same to the drum o .fa duplicating machine, this ybeing desirable'since the carrier sheet will preferably, be of greater strength than the stencil sheet -or its-backing, which' are thereby relieved of strain. I prefer, although this is not essential,'to secure the stencil sheet, A, to the carrier sheet, C, 'so' that when it is desired to introduce the stencil 'sheetinto the-Writing machine all that is necessary to complete the combination is to interleave the backing sheet, B, between the stencil, A, and the carrier sheet, C. Such carrier-sheet also tends to preserve the stencil-sheet against .accidental injury -When placing the latter 1n position on a duplicating-machine. After the stencil-sheet has been so positioned, the carrier-sheet, 'or a portion'thereot, is removed to permit ink to pass through the characters in the stencilsheet to the subjacent impression paper.

Having now described my invention, what I claim and desire to secure by Letters Patent is:

1. In stenciling material, the combination of two sheets superimposed for simultaneous insertion into a typewriting machine for the production of a stencil thereby, one of said sheets being dry but hygroscopic, the other sheet, underlying said firstnamed heet, being adapted to moisten the latter, substantially as described.

2. In stenciling material," the combination of two sheets superimposed for simultaneous insertion into a typeWriting machine for the production of a stencil thereby, one of said sheets being dry but 'hygroscopic, the other sheet, underlying` said first-named sheet, being adapted to moisten the lat-ter and to cushion the impact of the type thereon, substantially as described.

of two sheets superimposed for simultaneous insertion into a typewriting machine for the production of a stencil thereby,` one of said sheets comprising a porous base coated or impregnated with coagulated protein, the other sheet, underlying said first-named sheet, being adapted to moisten the latter, .substantially as described.

4.' In stenciling material, the combination of two sheets superimposed for simultaneous insertion into a typewriting machine for theprodu'ction of a stencil thereby, one of said sheets comprising a porous base coated or impregnatedwith coagulated protein, the other sheet, underlying said first-named sheet, :being adapted to moisten the latter and to cushion the impact of the type thereon, substantially as described.

-5. A backing-sheet adapted for insertion, in contact with a hygroscopic stencil-sheet, into a typewriting machine for the production of a stencil, said-backing-sheet being impregnated-with moisture, substantially as described.

6. A backing-sheet adapted for insertion, in contact with a hygroscopic stencil-sheet,

tion of a stencil said backing sheet being limpregnated with 'a moistening compound including glycerin and water, substantially as described.

'7. 'The process of .preparing a stencil groscopic stencil-sheet lupon an/ absorbent backing-sheet impregnated with moisture, simultaneously introducing said sheets into a typewriting machine and causing the type thereof to impact upon said stencil-sheet,

then removing said sheets from the machine 3. In stenciling material, the combination Y into a typewriting machine for the produc- `-which involves superimposing a dry but hyind separating the same, substantially as sheet, then removing said sheets from `the described. l i

8. The process -of preparing a; stencil tially as described.

machine and separating the same, substan- 4 which involves superimposinga dry but This specification si ed and witnessed l 5 hyg'oscollic stencil-heet upon a sog, moist this 27th day of Novem r, 1911.`

bac ing-s eet Where y said stencil-s eet will be aiected by the moisture in said backing- ALBERT BLAKE DICK sheet, simultaneously introducing'said sheets vWitnesses: into a typewriting machine and causing the W. G. ARNOLD,

10 type thereo to impact upon said stencil- W. A. WATERBURY. 

